osmo-hlr: allow configuring db path from cfg file

So far, the cmdline argument was the only way to set a database config file.
Add a similar config to VTY as 'hlr' / 'database'. The cmdline arg is stronger
than the 'database' cfg item. DB is not reloaded from VTY command.

Change-Id: I87b8673324e1e6225afb758fb4963ff3279ea3d8
4 files changed